자료유형  

 학위논문

Control Number  

0017164230

International Standard Book Number  

9798384486251

Dewey Decimal Classification Number  

530

Main Entry-Personal Name  

Ge, Guanqun.

Publication, Distribution, etc. (Imprint  

[S.l.] : Columbia University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

145 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

General Note  

Advisor: Karagiorgi, Georgia.

Dissertation Note  

Thesis (Ph.D.)--Columbia University, 2024.

Summary, Etc.  

요약The MicroBooNE experiment is a liquid argon time projection chamber with 85-ton active volume at Fermilab, operated from 2015 to 2020 to collect neutrino data from Fermilab's Booster Neutrino Beam. One of MicroBooNE's physics goals is to investigate possible explanations of the low-energy excess observed by the MiniBooNE experiment in νµ → νe neutrino oscillation measurements. MicroBooNE has performed searches to test hypothetical interpretations of the MiniBooNE low-energy excess, including the underestimation of the photon background or instrinic νe background. This thesis presents MicroBooNE's searches for two neutral current (NC) single-photon production processes that contribute to the photon background of the MiniBooNE measurement: NC ∆ resonance production followed by ∆ radiative decay: ∆ → N γ, and NC coherent single-photon production. Both searches take advantage of boosted decision trees to yield efficient background rejection, and a high-statistic NC π 0 measurement to constrain dominant background, and make use of MicroBooNE's first three years of data. The NC ∆ → N γ measurement yielded a bound on the ∆ radiative decay process at 2.3 times the predicted nominal rate at 90% confidence level (C.L.), disfavoring a candidate photon interpretation of the MiniBooNE low-energy excess as a factor of 3.18 times the nominal NC ∆ radiative decay rate at the 94.8% C.L. The NC coherent single photon measurement leads to the world's first experimental limit on the cross-section of this process below 1 GeV, of 1.49 x 10−41cm2 at 90% C.L., corresponding to 24.0 times the nominal prediction.

Subject Added Entry-Topical Term  

Physics.

Subject Added Entry-Topical Term  

Nuclear physics.

Subject Added Entry-Topical Term  

Plasma physics.

Subject Added Entry-Topical Term  

Particle physics.

Index Term-Uncontrolled  

Experimental high energy physics

Index Term-Uncontrolled  

Neutrino

Index Term-Uncontrolled  

MicroBooNE

Index Term-Uncontrolled  

Booster Neutrino Beam

Index Term-Uncontrolled  

MiniBooNE

Added Entry-Corporate Name  

Columbia University Physics

Host Item Entry  

Dissertations Abstracts International. 86-04B.

Electronic Location and Access  

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Control Number  

joongbu:657400